sound/core/rawmidi_compat.c

   1 /*
   2  *   32bit -> 64bit ioctl wrapper for raw MIDI API
   3  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  */
  20
  21 /* This file included from rawmidi.c */
  22
  23 #include <linux/compat.h>
  24
  25 struct sndrv_rawmidi_params32 {
  26         s32 stream;
  27         u32 buffer_size;
  28         u32 avail_min;
  29         unsigned int no_active_sensing; /* avoid bit-field */
  30         unsigned char reserved[16];
  31 } __attribute__((packed));
  32
  33 static int snd_rawmidi_ioctl_params_compat(snd_rawmidi_file_t *rfile,
  34                                            struct sndrv_rawmidi_params32 __user *src)
  35 {
  36         snd_rawmidi_params_t params;
  37         unsigned int val;
  38
  39         if (rfile->output == NULL)
  40                 return -EINVAL;
  41         if (get_user(params.stream, &src->stream) ||
  42             get_user(params.buffer_size, &src->buffer_size) ||
  43             get_user(params.avail_min, &src->avail_min) ||
  44             get_user(val, &src->no_active_sensing))
  45                 return -EFAULT;
  46         params.no_active_sensing = val;
  47         switch (params.stream) {
  48         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  49                 return snd_rawmidi_output_params(rfile->output, &params);
  50         case SNDRV_RAWMIDI_STREAM_INPUT:
  51                 return snd_rawmidi_input_params(rfile->input, &params);
  52         }
  53         return -EINVAL;
  54 }
  55
  56 struct sndrv_rawmidi_status32 {
  57         s32 stream;
  58         struct compat_timespec tstamp;
  59         u32 avail;
  60         u32 xruns;
  61         unsigned char reserved[16];
  62 } __attribute__((packed));
  63
  64 static int snd_rawmidi_ioctl_status_compat(snd_rawmidi_file_t *rfile,
  65                                            struct sndrv_rawmidi_status32 __user *src)
  66 {
  67         int err;
  68         snd_rawmidi_status_t status;
  69
  70         if (rfile->output == NULL)
  71                 return -EINVAL;
  72         if (get_user(status.stream, &src->stream))
  73                 return -EFAULT;
  74
  75         switch (status.stream) {
  76         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  77                 err = snd_rawmidi_output_status(rfile->output, &status);
  78                 break;
  79         case SNDRV_RAWMIDI_STREAM_INPUT:
  80                 err = snd_rawmidi_input_status(rfile->input, &status);
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85         if (err < 0)
  86                 return err;
  87
  88         if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
  89             put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
  90             put_user(status.avail, &src->avail) ||
  91             put_user(status.xruns, &src->xruns))
  92                 return -EFAULT;
  93
  94         return 0;
  95 }
  96
  97 enum {
  98         SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct sndrv_rawmidi_params32),
  99         SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct sndrv_rawmidi_status32),
 100 };
 101
 102 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 103 {
 104         snd_rawmidi_file_t *rfile;
 105         void __user *argp = compat_ptr(arg);
 106
 107         rfile = file->private_data;
 108         switch (cmd) {
 109         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 110         case SNDRV_RAWMIDI_IOCTL_INFO:
 111         case SNDRV_RAWMIDI_IOCTL_DROP:
 112         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 113                 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 114         case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 115                 return snd_rawmidi_ioctl_params_compat(rfile, argp);
 116         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 117                 return snd_rawmidi_ioctl_status_compat(rfile, argp);
 118         }
 119         return -ENOIOCTLCMD;
 120 }